METHOD FOR PROTECTING INTRAWELL EQUIPMENT FROM CORROSION AND SALT DEPOSITS Russian patent published in 2001 - IPC

FIELD: oil and gas production. SUBSTANCE: protection of inner surface of production string and outer surface of tubing string is accomplished by injecting working substance, in particular composition of corrosion and salt deposit inhibitor, which is dispensed under pressure, ejected being preheated by gaseous nitrogen through differentiating cone grid installed at the outlet of ejector, and pumped into annular space in the form of foam. When nitrogen pressure in gas bottle falls, composition is forced and dispensed through float-type dispenser into gas-foam generator with cone grid at outlet. Simultaneously, preheated gaseous nitrogen is fed to form foam, which is then transferred into tubular space. EFFECT: increased protection efficiency. 3 dwg